User`s guide

3.
Lift up the front end of the assembly and attach it to the top
of the computer case with the screw you removed earlier.
4.
Connect the ribbon and power cables as described in the next
section.
Connecting the IDE Ribbon and Power Cables
The IDE ribbon cable includes three connectors: P1, P2, and P3.
P1 connects to the main system board, and P2 and P3 connect to
the IDE drives.
P3
P1
If your system came with an IDE hard disk drive, this cable is
already installed. If so, follow the steps below to connect the
cable to the drive beginning with step 4.
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Installing and Removing Disk Drives